condition mean min max ZT0-3 3.2147175 2.97695 3.4524850000000002 ZT4-7 4.895365 4.895365 4.895365 ZT8-11 2.9612100000000003 2.9612100000000003 2.9612100000000003 ZT12-15 0 0 0 ZT16-19 1.6743835 1.6743835 1.6743835 ZT20-23 3.5768750000000002 3.5768750000000002 3.5768750000000002